This material is based upon work supported by the
National Science
Foundation under NSF-RUI Grant
No. PHY-0354920, NSF- RUI Grant
No. PHY-0651627, and the Michigan Space Grant Consortium.

Recent studies have brought into question the structure
of
neutron-rich 7He.To contribute to this
discussion, the energy and width of the ground state
of 7He has been measured with the Modular Neutron Array (MoNA) and
Sweeper
magnet
setup at the National Superconducting Cyclotron Laboratory.Proton stripping of 8Li in a Be target resulted
in the production of unbound 7He.Events were then reconstructed based on detected position
and energy in MoNA and a bank of charged particle detectors. Simulations made
to account for detector acceptances and efficiencies employed a Breit-Wigner
distribution with energy-dependent width to model the
unbound
state.Best fits of simulation to data indicate a
ground state energy of 400(10) keV with a full-width at half-maximum of 125(+40/-15)
keV.This study shows no strong evidence of any excited
state below 2 MeV.
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